/Engine/Plugins/Animation/ControlRig/Source/ControlRigDeveloper/Public/ControlRigBlueprint.h
Allow each blueprint type (AnimBlueprint or ControlRigBlueprint) to add specific UBlueprintNodeSpawners pertaining to the sub-class type. Serves as an extensible way for new nodes, and game module nodes to add themselves to context menus.
virtual void GetTypeActions ( [FBlueprintActionDatabaseRegistrar](API\Editor\BlueprintGraph\FBlueprintActionDatabaseRegistra-) & ActionRegistrar ) const